print(2420220065)
print("大数据1班温嘉怡")
# def factorial(a):
#     b=1
#     for i in range(1,a+1):
#         b*=i
#     return b
# print(factorial(5))
# 递归思想
def factorial(a):
    if a==0 or a==1:
        return 1
    return a*factorial(a-1)
print(factorial(5))
